Network: 一个来自Sygate的问题

今天早上在公司用Ethereal和tcpdump看了看网络情况，发现


09:32:33.965465 IP 219.133.48.87.8000 > 192.168.0.119.32769: UDP, length 56
09:32:33.968067 IP 192.168.0.119.32769 > 219.133.48.87.8000: UDP, length 28
09:32:34.020716 IP 219.133.48.87.8000 > 192.168.0.119.32769: UDP, length 632
09:32:34.705058 IP 192.168.0.10.3737 > 192.168.0.255.39213: UDP, length 268
09:32:34.705799 IP 192.168.0.10.3738 > 192.168.0.255.39213: UDP, length 112
09:32:36.478800 IP 219.133.48.87.8000 > 192.168.0.119.32769: UDP, length 64
09:32:36.537582 IP 192.168.0.10.3739 > 192.168.0.255.39213: UDP, length 824
09:32:37.208785 IP 192.168.0.10.3740 > 192.168.0.255.39213: UDP, length 268
09:32:37.209569 IP 192.168.0.10.3741 > 192.168.0.255.39213: UDP, length 112
09:32:38.914865 arp who-has 192.168.0.10 tell 192.168.0.119
09:32:38.915077 arp reply 192.168.0.10 is-at 00:50:04:ba:27:a1 (oui Unknown)
09:32:39.526133 NBF Packet: Datagram
09:32:39.652763 IP 192.168.0.10.3742 > 192.168.0.255.39213: UDP, length 268
09:32:39.653869 IP 192.168.0.10.3743 > 192.168.0.255.39213: UDP, length 824
09:32:39.654412 IP 192.168.0.10.3744 > 192.168.0.255.39213: UDP, length 112
09:32:39.995348 NBF Packet: Datagram
09:32:42.115367 IP 192.168.0.10.3745 > 192.168.0.255.39213: UDP, length 268
09:32:42.116102 IP 192.168.0.10.3746 > 192.168.0.255.39213: UDP, length 112
09:32:42.726195 IP 192.168.0.10.3747 > 192.168.0.255.39213: UDP, length 824
09:32:44.588784 IP 192.168.0.10.3748 > 192.168.0.255.39213: UDP, length 268
09:32:44.589503 IP 192.168.0.10.3749 > 192.168.0.255.39213: UDP, length 112
09:32:45.810432 IP 192.168.0.10.3750 > 192.168.0.255.39213: UDP, length 824


这样大量来自内部代理服务器 39213 udp 端口的广播，在查询Sygate的论坛后得到答案，是因为开启了Sygate的管理窗口造成了。原文解释如下


The traffic on UDP port 39213 is generated by Sygate manager when it is communicating information with all possible Sygate managers running on your network. Each Sygate manager program will send 1 packet to the network every few seconds. To stop this activity, you must close the Sygate manager and then remove it from your task bar (right click on it and choose exit).

This does not affect Internet sharing as that is done by a background process independent of Sygate manager.